Spring



lowing is a specification,

Intra STATES PATENT Fries.

JOHN HV. DAVIs, on COVINGTON, KENTUCKY.

SPRING.l

SPECIFICATION' forming' part of Letters Patent No. 337,048, dated March 2, 1886.

l Application died November 23, 1885. Serial No. 11 =3,635. (No model.)

T0 all whom it may concern.-

Be it known that I, JOHN H. DAVIS, a citizen of the United States, residing at Covington, in the county of Kenton, State of Kentucky, have invented certain new and useful Improvements in Springs, of which the folreference being had therein to the accompanying drawings.

My invention cmprises a compound spring that can be readily applied either to vehicles, cars, mechanical purposes generally', or any other use for which such devices are adapted.

Said compound device consists of a pair of conical coiled springs placed in line with each other, and with a movable disk, washer, or head interposed between their inner ends, the springs and washer being iitted within a cy' lindrical cage or housing composed of two sect-ions, one member of which is adapted to slide or telescope within theother or chambered section, so as to allow the properpla-y or motion. A tie-bolt occupies an axial position within the device, which bolt serves the twofold purpose of a central guide for the disk and springs, and also prevents the p cylindrical housings becoming separated from each other by any un'usualexpansion or opening ofthe said tie-rod being passed through a central opening of said disk, as hereinafter more fully described.

In the annexed drawings, Figure 1 is an axial section of the preferred arrangement of my springs. Fig. 2 is a side elevation of one of said springs detached from the case or housing. Fig. 3 is a horizontal section of the housing, takenat the line c z of Fig. 1. Fig. 4 is' an axial section of` a modification of the invention. I

A represents a cylindrical cage, case, or housing open at one end, but closed at the other, andl having a perforated flange, collar, or base, B, wherewith said cylinder is secured to a suitable support. The open end of this housing is adapted toftwithin an enlarge-A ment, chamber, or counterbore, C, of another cylinder, D, the latter being provided with a perforated flange, E, for attachment to any bearing. Occupying an axial position within these cylinders is through a central orifice, G, of a movable a tie-bolt, F, that passes.

n spring J is represented J, composed o f any desired number of coils. lOf these springs the lower one, I, is inverted-that i`s to say, end of cylinder A,

its apex rests on the closed but the base of v the upper spring, J, rests on this disk, and its apex supports the cylinder D.

From the above description it is apparent that any load .placed upon the upper cylinder or housing, D, will be supported bythe united action of the two springs I and J, and any compression of said springs will cause said housing to descend accordingly, this descent being limited by the upper end of counterbore C coming in contact with cylinder A; but when the load is removed the bolt F acts as a t-ie that prevents separation of the two sections A and D of the housing. In Fig. 1 some considerable clearance is shown between the smaller coils ofy the springs and the axial rod or bolt, but in Fig. 2 the smaller coil of as being quite near said rod, thereby indicating that the springs may be arrangedl to suit any special requirenient.

In Fig. 4, the apices of the springs I J are shown in contact with the disk H, while the bases of said springs bear against the opposite ends of the cylinders A D. Furthermore,

this illustration shows the disk H, provided with an annular flange, K,'that serves as a guide to confine said disk to a proper path as "itpla-ys within the housing every time the springs expand or contract. p

I am aware of ythe peculiar arrangement of conical volute-springs seen in the patent issued to It. Vose, October 2 8, 1862, No. 36,813; also, I am aware of the arrangement of such springs as seen in English Patents No. 12,122 of 1848.' and No. 4,310 of 1875. Therefore,

while its base or greatestv l diameter supports the disk H, just referred to;-

my claim is not to be construedas anl ataV tempt to cover the arrangement of springs seen in either of these patents, but is limited to the peculiar construction herein shown and described.

I claim'as my inventionopening, G, of said disk and occupies an lThe combination of apair of conical voluteaxial position within said springs, as herein springs, I J, placed in line with each other described.

and having a movable disk, H, interposed In testimony whereof Iaix my signature in between their inner'ends, the outer ends of presence of two witnesses.

saidssprings being in contact with the oppoq site heads of the cylindrical housings A D, JOHN H' DAVL" one of which is chambered at C, and a tie- XVitnesses: v rod, F, being employed tounite said hous- Y JAMES H. LAYMAN,

i ings, which tie-rod passesv through a central SAML. S. CARPENTER. l 

